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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3bc7863fac99f5a62909d3242bdc93f5f7f2904b9a8aff0bbac792057ba805' 
  AND token = 'pv7I88QJTIJhDtiE5pDmSwiGENLFt7kHKeGaijGwt7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}